Compression damage and failure mechanism of C/C-SiC satin woven composites with void defects

To study the compressive mechanical properties and failure mechanism of satin woven composites with void defects， the longitudinal compression experiments on C/C-SiC satin woven composites with void defects were conducted. The microscopic strength prediction model of satin woven composites with void defects was established by introducing random pores through the explosive fragment algorithm based on the discrete element method. Based on this model， the progressive failure process of the mesoscopic model under meridional compression load was simulated， revealing the influence of pores on the damage process. The progressive damage process and failure mechanism prediction model are verified by experimental data. The results show that the main failure modes of the material under warp compression load are shear failure and delamination failure， manifesting in three forms： interlaminar local matrix cracking and associated， delamination between the matrix and the warp， complete or partial fracture along the warp and weft debonding and matrix separation， weft cracking. At the same time， the numerical simulation results are basically the same as the experimental values， which verifies the validity of the model of C/C-SiC satin woven composites with void defects， and provides an effective method for the study of mechanical properties of two-dimensional woven composites.